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Replaced exponential avg. by block-average for MPP measurement

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This commit is contained in:
Thomas Kolb 2016-08-21 19:04:22 +02:00
parent 0e59b70465
commit 56b44e8d1e
1 changed files with 22 additions and 3 deletions
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25
src/main.c
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@ -373,9 +373,12 @@ struct MPPState {
fxp_t maxPower; fxp_t maxPower;
int32_t maxPWM; int32_t maxPWM;
fxp_t powerAccu;
int32_t powerSamples;
}; };
#define MPP_TEST_DURATION 25 /* ms */ #define MPP_TEST_DURATION 10 /* ms */
#define MPP_TEST_STEPS 4 #define MPP_TEST_STEPS 4
const int32_t mpp_pwm_offsets[MPP_TEST_STEPS] = {-51, -4, 5, 50}; const int32_t mpp_pwm_offsets[MPP_TEST_STEPS] = {-51, -4, 5, 50};
@ -397,12 +400,24 @@ static void mpp_run(
mpp_state->maxPower = 0; mpp_state->maxPower = 0;
mpp_state->maxPWM = *pwm; mpp_state->maxPWM = *pwm;
mpp_state->powerAccu = 0;
mpp_state->powerSamples = 0;
*pwm = *pwm + mpp_pwm_offsets[0]; *pwm = *pwm + mpp_pwm_offsets[0];
} else if(mpp_state->testIdx < MPP_TEST_STEPS) { } else if(mpp_state->testIdx < MPP_TEST_STEPS) {
/* test running */ /* test running */
/* accumulation */
mpp_state->powerAccu = fxp_add(mpp_state->powerAccu,
fxp_mult(power_state->vout, power_state->current));
mpp_state->powerSamples++;
if(time_in_state > mpp_state->nextTestStepTime) { if(time_in_state > mpp_state->nextTestStepTime) {
if(power_state->power_avg > mpp_state->maxPower) { /* averaging */
mpp_state->maxPower = power_state->power_avg; mpp_state->powerAccu = fxp_div(mpp_state->powerAccu, fxp_from_int(mpp_state->powerSamples));
if(mpp_state->powerAccu > mpp_state->maxPower) {
mpp_state->maxPower = mpp_state->powerAccu;
mpp_state->maxPWM = *pwm; mpp_state->maxPWM = *pwm;
} }
@ -412,6 +427,10 @@ static void mpp_run(
*pwm = mpp_state->refPWM + mpp_pwm_offsets[mpp_state->testIdx]; *pwm = mpp_state->refPWM + mpp_pwm_offsets[mpp_state->testIdx];
mpp_state->nextTestStepTime = time_in_state + MPP_TEST_DURATION; mpp_state->nextTestStepTime = time_in_state + MPP_TEST_DURATION;
mpp_state->powerAccu = 0;
mpp_state->powerSamples = 0;
} }
} }